Experimental Design

Front

What is the DEPENDENT variable (effect) in this experiment? "Does eating breakfast improve test scores?"

Back

the grade you got on the test

Front

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

Back

The type of liquid

Front

What is the independent variable in Mr. Pransky's experiment on how different surfaces affect a tennis ball's bounce height?

Back

the different surfaces

Front

What is the dependent variable when testing the time it took for objects of different sizes to reach the ground after being dropped from 30 feet in the air?

Back

The time it takes for each object to hit the ground.

Front

What is the independent variable in the hypothesis: "If salt is added to water then the boiling point of water will decrease (go down)."?

Back

Whether salt is added or not

Front

In any experiment, the independent variable ______________.

Back

is purposely changed to test the hypothesis

Front

How many variables can be tested in a controlled experiment?

Back

one

Front

Why do we want to test one variable at a time?

Back

To know what is causing the changes

Front

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted.

Back

control group

Front

What is the control group in the test comparing three cleaners to tap water?

Back

tap water